Age, Growth and Proposed Management of the Lake Sturgeon (Acipenser Fulvescens) in the Hudson Bay Lowland PDF Download
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Author: Ontario. Ministry of Natural Resources
Publisher:
ISBN:
Category :
Languages : en
Pages : 106
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Author: Ontario. Ministry of Natural Resources
Publisher:
ISBN:
Category :
Languages : en
Pages : 106
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Book Description
Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 640
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Author: Patrick Williot
Publisher: Cemagref
ISBN:
Category : Acipenser
Languages : en
Pages : 524
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Book Description
Author: Dianne Newell
Publisher: University of Toronto Press
ISBN: 9780802079596
Category : Business & Economics
Languages : en
Pages : 388
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Book Description
Using case studies drawn from across Canada, the papers demonstrate that there are many shared issues in the various small-scale fisheries of this country, and locate small-scale fisheries in their historical context as well as in that of global concerns.
Author: David K. Berry
Publisher:
ISBN: 9780773250871
Category : Lake sturgeon
Languages : en
Pages : 20
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Author: Kevin E. Wehrly
Publisher:
ISBN:
Category : Lake sturgeon
Languages : en
Pages : 29
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Author: James Andrew Crossman
Publisher:
ISBN:
Category : Fish stocking
Languages : en
Pages : 388
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Author: David Carl Caroffino
Publisher:
ISBN:
Category : Lake sturgeon
Languages : en
Pages : 256
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Book Description
"Populations of lake sturgeon Acipenser fulvescens in the Laurentian Great Lakes have not recovered after dramatic declines in the late 1800s despite the implementation of numerous recovery plans. Although extensive lake sturgeon research has and continues to occur, critical knowledge gaps remain. Recruitment of lake sturgeon is variable, but the extent of that variation, its limiting factors, and mortality rates experienced by early life stages are unclear. The purpose of this study was to increase our understanding of lake sturgeon early life stages by examining characteristics of a remnant population in the Peshtigo River, Wisconsin. Specifically, this research sought to empirically estimate rates of early life stage mortality, describe the vertical distribution of drifting larvae, evaluate the impacts of predation on recruitment, and describe patterns in movement and abundance of age-0 juveniles. Extensive sampling of lake sturgeon eggs, larvae, age-0 juveniles, and potential predators occurred during 2006 and 2007. Although drifting lake juveniles potential during sturgeon larvae were captured in all parts of the water column, more were found near the Surface than the substrate. After drifting to nursery areas, individuals exhibited variable movement patterns. Some fish were never recaptured more than 10 m from the initial capture site, while other individuals moved more than 9 km. Even though absolute abundance of juveniles differed by an order of magnitude between 2006 and 2007, a pattern of steady decline during the summer months was similar during both years. This downstream movement may have resulted in emigration from the Peshtigo River, as there was no evidence of predation on this life stage. Overall mortality from the egg to age-0 juvenile life stage exceeded 99.9% in both study years. Predation on eggs was extensive by both crayfish and fish (white sucker Catostomus commersonii), but was minimal on other life stages. These results suggest that recruitment can vary significantly, and predation is likely only limiting at the egg life stage. These results will allow more effective monitoring and management of lake sturgeon early life stages, thereby promoting population recovery"--Leaves iii-iv.
Author:
Publisher:
ISBN:
Category : Lake sturgeon
Languages : en
Pages : 43
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"Raising lake sturgeon (Acipenser fulvescens) in hatcheries is an important tool for rehabilitation and conservation, but is expensive. When hatchery sturgeon do not grow large enough before stocking, their odds of survival decline significantly and resources are wasted. We investigated the potential limiting effect of large lake sturgeon on the growth rate of smaller conspecifics housed in the same tank, and the possibility of increasing growth rates by separating individuals into different size classes. We also examined plasma cortisol levels of the different size classes over time as an indicator of stress levels, and levels of free plasma thyroid hormones triiodothyronine (T3) and thyroxine (T4). A single family of lake sturgeon (one male/female cross) was raised in the Northern Michigan University Aquatics laboratory for one year. Growth of the sturgeon was determined both as group averages and for individuals. Separating lake sturgeon by size group had no discernable effect on average growth rates in any of the size categories, but individuals within size groups did show increased growth rates. All three categories ended the experiment with broadened size distributions. Cortisol levels showed no consistent differences based on size (Cortisol [pg/mL ± SE] =229.27 ± 11.21). Plasma thyroid hormone levels were also similar between size categories (T3 [pg/mL ± SE] =8.53 ± 0.26; T4=0.86 ± 0.04). Separation of lake sturgeon by size category does not appear to increase their average growth rates in captivity, but all size groups continued to increase in size throughout the experiment."--Abstract.
Author: James Philip Baker
Publisher:
ISBN:
Category : Lake sturgeon
Languages : en
Pages : 105
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Book Description
